linux-kernel - Re: [PATCH] perf_events: fix ordering bug in perf_output

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Date:	Thu, 18 Mar 2010 19:33:14 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	eranian@...gle.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com, robert.richter@....com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com
Subject: Re: [PATCH] perf_events: fix ordering bug in perf_output_sample()

On Thu, 2010-03-18 at 14:42 +0200, Stephane Eranian wrote:
> 	In order to parse a sample correctly based on the information
> 	requested via sample_type, the kernel needs to save each component
> 	in a known order. There is no type value saved with each component.
> 	The current convention is that each component is saved according to
> 	the order in enum perf_event_sample_format. But perf_output_sample()
> 	was not completely following this convention, thereby making samples
> 	impossible to parse without internal kernel knowledge.
> 
> 	This patch puts things in the right order.

NAK, not so actually, its in the order specified in the
PERF_RECORD_SAMPLE comment.

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